public async Task TestInsertAsync_VerifySaveChangesCalledOnce()
{
SetUpMockData();
var taskRepository = new TaskManagerRepository(mockContext.Object);
var taskDetail = new TaskItem()
{
Id = 1, Name = "Task 1 ", Priority = 10
};
var mockSet = new Mock <DbSet <TaskItem> >();
mockContext.Setup(m => m.Tasks).Returns(mockSet.Object);
var result = await taskRepository.InsertAsync(taskDetail);
mockSet.Verify(m => m.Add(taskDetail), Times.Once);
mockContext.Verify(m => m.SaveChangesAsync(System.Threading.CancellationToken.None), Times.Once);
}